"And as if feeling lonely wasn’t bad enough, it also turns out that loneliness and isolation are shockingly bad for your health and wellbeing. The quality of your friendships is the largest predictor of your happiness. Social isolation weakens your immune system, raises your blood pressure, messes with your sleep, and can be as bad for you as smoking 15 cigarettes a day. According to the authors of a widely cited meta-analysis, loneliness on its own can increase your chances of an early death by 30 percent and “heightened risk for mortality from a lack of social relationships is greater than that from obesity.” And in practical terms, being in contact with nobody in an emergency, like the men in the Chicago heat wave, can kill you in an instant."
http://hazlitt.net/longreads/legion-lonely
http://hazlitt.net/longreads/legion-lonely